Add the SQLITE_MINIMUM_FILE_DESCRIPTOR compile-time option, for control over

exactly which low-numbered file descriptors SQLite will use.

FossilOrigin-Name: ba5190534330a25722eeb7ea9c42da7a6d146014

manifest

@@ -1,5 +1,5 @@
-C Add\sa\stest\sfor\sfts4\sunicode61\soption\sremove_diacritics=0.
-D 2013-08-30T13:29:51.754
+C Add\sthe\sSQLITE_MINIMUM_FILE_DESCRIPTOR\scompile-time\soption,\sfor\scontrol\sover\nexactly\swhich\slow-numbered\sfile\sdescriptors\sSQLite\swill\suse.
+D 2013-08-30T14:24:12.062
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -202,7 +202,7 @@ F src/notify.c 976dd0f6171d4588e89e874fcc765e92914b6d30
 F src/os.c b4ad71336fd96f97776f75587cd9e8218288f5be
 F src/os.h 4a46270a64e9193af4a0aaa3bc2c66dc07c29b3f
 F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
-F src/os_unix.c 81271e38084e74ddc6602ee5a80ea0a7d5dfacf9
+F src/os_unix.c 7d5f3c51db561804e3ff3d47970a58bc6ea4d662
 F src/os_win.c 26d752736dff0c7e4e384ab65b353cce1e7e19c5
 F src/pager.c 2aa4444ffe86e9282d03bc349a4a5e49bd77c0e8
 F src/pager.h f094af9f6ececfaa8a1e93876905a4f34233fb0c
@@ -1109,7 +1109,7 @@ F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
 F tool/wherecosttest.c f407dc4c79786982a475261866a161cd007947ae
 F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
-P d9c018f8155ab48df8e0e02519bba50588fe49fc
-R ea091c59207c769dfe7c01daedbc5f93
-U dan
-Z c2684be8ef49bf7c2f428934c35768a0
+P 6bf7ae6ff6b18712544ddeafb6848b3b27ff22d2
+R f869b9c4782ea4938d88f3fd8f2e185a
+U drh
+Z 55a1a5eb28d49163aa7c79ea9937ef28

manifest.uuid

@@ -1 +1 @@
-6bf7ae6ff6b18712544ddeafb6848b3b27ff22d2
+ba5190534330a25722eeb7ea9c42da7a6d146014

src/os_unix.c

@@ -551,6 +551,15 @@ static const char *unixNextSystemCall(sqlite3_vfs *p, const char *zName){
   return 0;
 }
 
+/*
+** Do not accept any file descriptor less than this value, in order to avoid
+** opening database file using file descriptors that are commonly used for 
+** standard input, output, and error.
+*/
+#ifndef SQLITE_MINIMUM_FILE_DESCRIPTOR
+# define SQLITE_MINIMUM_FILE_DESCRIPTOR 3
+#endif
+
 /*
 ** Invoke open().  Do so multiple times, until it either succeeds or
 ** fails for some reason other than EINTR.
@@ -581,7 +590,7 @@ static int robust_open(const char *z, int f, mode_t m){
       if( errno==EINTR ) continue;
       break;
     }
-    if( fd>2 ) break;
+    if( fd>=SQLITE_MINIMUM_FILE_DESCRIPTOR ) break;
     osClose(fd);
     sqlite3_log(SQLITE_WARNING, 
                 "attempt to open \"%s\" as file descriptor %d", z, fd);